IT'S FALLING APART! HELP!

1993 Isuzu Amigo

1993 Isuzu Amigo 4 cyl Four Wheel Drive Manual 159000 miles

it's a 93 amigo with a 3" lift and 35 inch tires.......Everytime i turn a corner i can feel something in my steering wheel grinding i have a feeling it's the idler or pitman arm, not sure though. Also it has lost dramatic power over the past week i have to downshift on roads i never had to before. The heat also is only working if im driving, i come to a stop and it gets cold. I need HELP